ICD-10 Code for Mononeuritis
The ICD-10-CM code for mononeuritis is G58.9 — Mononeuropathy, unspecified. This is the code the Alphabetic Index gives for mononeuritis with no further qualifier, valid for FY2027 (October 1, 2026 – September 30, 2027).
G58.9 is billable but unspecified. If the documentation names a type, site or cause, one of the more specific codes below is likely expected.
Which mononeuritis code should you use?
The Alphabetic Index lists 17 codes under Mononeuritis. Which one applies depends on the qualifier documented in the record — the type, site, cause, or associated condition. Find the qualifier below, then verify the code in the Tabular List before using it.
By type
| femoral nerve | G57.2Not billable | Lesion of femoral nerve |
| lower limb | G57.9Not billable | Unspecified mononeuropathy of lower limb |
| medial popliteal nerve | G57.4Not billable | Lesion of medial popliteal nerve |
| median nerve | G56.1Not billable | Other lesions of median nerve |
| multiplex | G58.7 | Mononeuritis multiplex |
| plantar nerve | G57.6Not billable | Lesion of plantar nerve |
| posterior tibial nerve | G57.5Not billable | Tarsal tunnel syndrome |
| radial nerve | G56.3Not billable | Lesion of radial nerve |
| sciatic nerve | G57.0Not billable | Lesion of sciatic nerve |
| specified NEC | G58.8 | Other specified mononeuropathies |
| tibial nerve | G57.4Not billable | Lesion of medial popliteal nerve |
| ulnar nerve | G56.2Not billable | Lesion of ulnar nerve |
| upper limb | G56.9Not billable | Unspecified mononeuropathy of upper limb |
Mononeuritis lateral
Mononeuritis lower limb
| specified nerve NEC | G57.8Not billable | Other specified mononeuropathies of lower limb |
Mononeuritis upper limb
| specified nerve NEC | G56.8Not billable | Other specified mononeuropathies of upper limb |
Index terms and codes are reproduced from the official ICD-10-CM FY2027 release. The Alphabetic Index is a finding aid — a code must always be verified in the Tabular List before it is reported. Data sources